[docs] [issue17894] Edits to descriptor howto

[Antoine Pitrou]

Antoine Pitrou added the comment:

> in contrast to an authoritative document closely tied to the actually 
> implementation details

I fail to understand why a HOWTO should be an authoritative document closely tied to implementation details. If you don't want this document to be beginner-friendly, please move it into the language reference, not the HOWTO directory.

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nosy: +pitrou

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